Libpeas is a gobject-based plugins engine, and is targetted at giving
every application the chance to assume its own extensibility.
It also has a set of features including, but not limited to:
- multiple extension points
- on demand (lazy) programming language support for C, Python and JS
- simplicity of the API

lgi and luajit are autodetected optional dependencies: if you have 
both in your system, only the second is used.
